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Viewing File: __init__.py

# Copyright 2018 gRPC authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""gRPC's experimental APIs.

These APIs are subject to be removed during any minor version release.
"""

import copy
import functools
import sys
import warnings

import grpc
from grpc._cython import cygrpc as _cygrpc

_EXPERIMENTAL_APIS_USED = set()


class ChannelOptions(object):
    """Indicates a channel option unique to gRPC Python.

    This enumeration is part of an EXPERIMENTAL API.

    Attributes:
      SingleThreadedUnaryStream: Perform unary-stream RPCs on a single thread.
    """

    SingleThreadedUnaryStream = "SingleThreadedUnaryStream"


class UsageError(Exception):
    """Raised by the gRPC library to indicate usage not allowed by the API."""


# It's important that there be a single insecure credentials object so that its
# hash is deterministic and can be used for indexing in the simple stubs cache.
_insecure_channel_credentials = grpc.ChannelCredentials(
    _cygrpc.channel_credentials_insecure()
)


def insecure_channel_credentials():
    """Creates a ChannelCredentials for use with an insecure channel.

    THIS IS AN EXPERIMENTAL API.
    """
    return _insecure_channel_credentials


class ExperimentalApiWarning(Warning):
    """A warning that an API is experimental."""


def _warn_experimental(api_name, stack_offset):
    if api_name not in _EXPERIMENTAL_APIS_USED:
        _EXPERIMENTAL_APIS_USED.add(api_name)
        msg = (
            "'{}' is an experimental API. It is subject to change or ".format(
                api_name
            )
            + "removal between minor releases. Proceed with caution."
        )
        warnings.warn(msg, ExperimentalApiWarning, stacklevel=2 + stack_offset)


def experimental_api(f):
    @functools.wraps(f)
    def _wrapper(*args, **kwargs):
        _warn_experimental(f.__name__, 1)
        return f(*args, **kwargs)

    return _wrapper


def wrap_server_method_handler(wrapper, handler):
    """Wraps the server method handler function.

    The server implementation requires all server handlers being wrapped as
    RpcMethodHandler objects. This helper function ease the pain of writing
    server handler wrappers.

    Args:
        wrapper: A wrapper function that takes in a method handler behavior
          (the actual function) and returns a wrapped function.
        handler: A RpcMethodHandler object to be wrapped.

    Returns:
        A newly created RpcMethodHandler.
    """
    if not handler:
        return None

    if not handler.request_streaming:
        if not handler.response_streaming:
            # NOTE(lidiz) _replace is a public API:
            #   https://docs.python.org/dev/library/collections.html
            return handler._replace(unary_unary=wrapper(handler.unary_unary))
        return handler._replace(unary_stream=wrapper(handler.unary_stream))
    if not handler.response_streaming:
        return handler._replace(stream_unary=wrapper(handler.stream_unary))
    return handler._replace(stream_stream=wrapper(handler.stream_stream))


__all__ = (
    "ChannelOptions",
    "ExperimentalApiWarning",
    "UsageError",
    "insecure_channel_credentials",
    "wrap_server_method_handler",
)

if sys.version_info > (3, 6):
    from grpc._simple_stubs import stream_stream
    from grpc._simple_stubs import stream_unary
    from grpc._simple_stubs import unary_stream
    from grpc._simple_stubs import unary_unary

    __all__ += (
        "unary_unary",
        "unary_stream",
        "stream_unary",
        "stream_stream",
    )
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